| 释义 |
micrite Geol.|ˈmɪkraɪt|
[f. microcrystalline a. + -ite1.]
Microcrystalline calcite present as an interstitial constituent or matrix material in some kinds of limestone; a limestone consisting chiefly of this.
1959R. L. Folk in Bull. Amer. Assoc. Petroleum Geologists XLIII. 17 Finally, it was decided to use a composite word, the first part of which refers to the allochem composition... Whether the rock is type I or type II is shown by the second part of the name ‘-sparite’ for those with sparry calcite cement and ‘-micrite’ (pronounced ‘mick-rite’) for those with microcrystalline ooze matrix... Type III limestones, almost entirely ooze, are designated simply as ‘micrite’ without any allochem prefix. 1970K. C. Jackson Textbk. Lithology vi. 401 The proportion of micrite in limestone varies from a minor interstitial filling between allochems to the entire rock. 1973Nature 2 Mar. 41/2 The patch reef, 13 m long and over 2 m high, tongues out to the west into 2 m of thinly bedded calcitic micrites of quiet water origin.
Hence miˈcritic a., containing a high proportion of micrite.
1962Leighton & Pendexter in Mem. Amer. Assoc. Petroleum Geologists I. 37/2 Photographs A and B..illustrate limestones composed of 90 per cent, or more, micrite. Two subtypes of these micritic limestones are recognized. 1973Nature 20 July 145/2 The deep water Alpine Triassic is represented by cherty, micritic, radiolarian limestones with thin-shelled pelecypods. |